<a href="/admin/enviar">enviar correo</a>

var transporter = nodemailer.createTransport({
    service: 'gmail',

    auth: {
        user: 'danielroca7derc@gmail.com',
        pass: '*********'
    }
});
router.get('/enviar', function (req, res, next) {
        console.log("voy a enviar un correo");
        var mailOptions = {
            from: '"ColSport ?" <danielroca7derc@gmail.com>', // sender address
            to: 'danielroca_7@hotmail.com, danielroca7derc@gmail.com', // list of receivers
            subject: 'Hello ✔', // Subject line
            text: 'Hello world ?', // plaintext body
            html: '<b>Hello world ?</b>' // html body
         };
        transporter.sendMail(mailOptions, function(error, info) {
            if (error) {
                return console.log(error);
            }
            console.log('Message %s sent: %s', info.messageId, info.response);
        });
        res.redirect('back');
    })